Pradosh Vrat dates based on Hindu calendar and Panchang in 2015. Pradosh is an auspicious day dedicated to Hindu God Shiva. The Vrat falls on the 13th day of every lunar fortnight in traditional Hindu calendar. Below are the Pradosh Vrat dates in 2015. Shiva devotees fast from sunrise to sunset and important rituals and pujas are held during the twilight period. Usually there are only two Pradosh in a month.